hi，guys！I am useing sliding mesh to simulate the relative motion between the trian and tunnel.it is easy to converge,but the result is beyond my imaging，and wrong.attached is the fluent model and result contour.Any suggesiton or advice is appreciated.

Thanks ,Raashid.The velocity is 350km per hour.The attached are pictures of local mesh aroun the nose shape，and boundary set.If more information is needed,please feel free to email to shiren77@gmail.com.